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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d2ea2c1e96269329e3c37ff4c9fd0979952e2b85ac1ae358ace94c6861df31' 
  AND token = 'FO3NfV/6sY6RLc4FZKfs0QJY8ikynA49rh3VVibRRmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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