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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca8aaeeeb80028d37b2966f0028e89283c933e3d2ed7d0251553c720447ba5d' 
  AND token = '6JvrY8O7Sx3PPG3Gnn94ziPG8uZFgZVO3Pt1iqRklJ0=' 
  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"
    }
  }
}