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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e189ba067d21966228027f361ab8c905d7b6b1f7c096f96cd32689a9799a3a44' 
  AND token = 'RRN8nnf97J4TcuCbi+Vf5Yy7k6/iahHOX3v/tdLHSsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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