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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11eb6043cabf18c0cebb6897b9ee726218a7bb5b36c31b54fc5cf67859e3aad' 
  AND token = 'Q2CHV+IyVn1a7AtHE88m5AqAnqwIf4ubfrOIk8HIEw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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