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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7a404d38cc131266dbc19ff6f959b238eb9f8c28ca93f0cfc389ef72d9b521' 
  AND token = 'FQ1FtkWH3ecw3hC2PwQtYUPKWj5enRBnTfG0fNIY9Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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