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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7dae4690024e09f0ea2a8165e39952747ea66b4204d1d80269bfc9332e22ab3' 
  AND token = 'uBsUhJZ1x0BKirbyA1KCsVQDOss/youBymBUdd8qy7g=' 
  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"
    }
  }
}