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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa45c26013cc96d3082bf6829763558384cb47c6ebc0012d2842b1f1952c1485' 
  AND token = 'TT6fnj3ztXe/7mhaDN7OhcEQLqaXRa9WkVtYMfd8uR4=' 
  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"
    }
  }
}