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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b00b7d7c0fee8f24e1c8eb8665cf5b9c70f72b5b8fec400cd77c2a66cb4378f' 
  AND token = 'nTDnd0bAWNXSIzEwLBfvYcGNV0f0vj8aT6571A9xxqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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