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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116329864895749aa6712e9adf75a5e9dfababc23e853db164c0e77b1b08cf0b' 
  AND token = 'iXchopsmSdHZLghxJNA8kS7IHgxQbLA3v1d/7aK78u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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