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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ae5167edd3a6fa7c95d5dc954d133631fa78f64ea5b10c7c511d182921d32d' 
  AND token = 'fim2UwEzwVTO27ZFnX4Hdpr9E90qSF+PX1UxyhHKXPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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