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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f7d7bafeebfd8cad4d35b07181a2c4dc5e322b5298fd61cd2ce7cf04d36781' 
  AND token = '2EZt/fK++5gV6+ietN2rylk+Ll6HIGCWGHrtQrkEYNc=' 
  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"
    }
  }
}