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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40f418369a4e636d75bd0f9b96224b7f9f1a764e2c809a9196b0e79c50258ce' 
  AND token = 'rIoLglWhZCfUt8WyhlvlK/OYXRgAL7dy72dfrLIjepo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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