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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89705d5c331e61c83ddeafb8046402fc1c1c02f0371f61981299c97f8e862b76' 
  AND token = '4a+TQp8eS7PoIu6HY7XIhRp0vjsjgMiyrYSnUtgt+P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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