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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9756fba25f61c1bee77ff44e863e535ab2fba0568b4e24dfbf7cd5dc3472f8e7' 
  AND token = 'L+DjhUOfddxOibSInlbXXhjh6sG4/oPUZEig7X09ogY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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