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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '428a75c4303ed21c97a9b005a13f490f02c80004a1832b85c3b169e596fb2d32' 
  AND token = 'rqm4c+aw5/CHEZZxUxgCA2BzD+gp8jRc102mG3rGUwU=' 
  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"
    }
  }
}