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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b54deb423908d01803942506ea5b88aaa56bf4ceb9b128ef3ac5854442196e' 
  AND token = 'qob6YC3YGc2ZVAT8SH0SS7FTJu4FzJPwSWeXR68qBfA=' 
  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"
    }
  }
}