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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fec10c0cd5f12c5599973958bf0fa463b4de09e272ec1aab0363131d4f75d9' 
  AND token = 'XTU4yFy7xeLqXyn5/SPSGicdIFD9kTfuEeqTG5G3NC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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