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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57080139374e4b52f09579ff3c662ef55b74972d5e781cfbf62929cce0f37271' 
  AND token = 'B9vAmEL5wtkiTaVRqn1Rj/hK46jeemcnfxiEf/Z2Eik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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