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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b9dde414d5ec4adcdbaf4c8ab805f53e5a88848694719ea8d271a19fb6f239' 
  AND token = '61+cCpcsupcXRx2Qb4OETRG/cx+sKsMp5W+RF1yEj2k=' 
  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"
    }
  }
}