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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78010d9358db1ab5677a954643aa577a761dc1458e6591c4292beaf4bcd0b2b9' 
  AND token = 'FelUdj2B+JzZp++ksCiavdrg2ToiL+MmQ589Sdx5MBU=' 
  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"
    }
  }
}