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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75f9527746a26752e55011a28136bd67c01fbbc2053cb5e7a035c34f4f542b8' 
  AND token = 'TMQmbqqYm58L5K5AAOXt/5ukMwk72xt1FzXGaByoKP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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