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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf953965fcb1044a73ac918a2423f0f657557ec65f5da481bece9f08267fe5c' 
  AND token = 'vpM93QYZL8eo2mMvo8OXn2nsOVRtoEwiHJB/obQWx6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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