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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f97f6a48ad446d0783a8d7995c4ea81c1afce6c66808fe70dd20af8e68320e0' 
  AND token = 'PixW/N2ZF5TqHGQWdP59Xs1MjEkzS07HApf9lUvHT58=' 
  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"
    }
  }
}