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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d51ab4efa5ece43ab143a308bf619514c4d0e5d710e5a2780943c25c76a2c3' 
  AND token = 'qtlCwiHdCn+r3yttLGVo4Ld0jpEOoQWeX0jPsxFz/hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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