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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8889c9f10b318c16b30cb8b8a907fb3ecfaced62e9296c953c9454d3f287f387' 
  AND token = 'aW5SYOUVLdOSVxXr2QloVtDhSbeRpY90MToCSktiBX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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