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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b64aef003e43611f9f0d65b5eca1714dfd7ea2562cfb81219b4eeaeacd98a1' 
  AND token = '/ZwnA1pC+1vqp51mwWl+odSuZn2qLvDcq99VU+JOgdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}