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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '045b8a207a718f293dc5407feea81e46398d5c3f8396b515b56e8da7493c50f7' 
  AND token = 'r5BajtJ0zlf219ip+6S1bc5ibDZ1lrx+QFvb+KbsrIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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