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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb70a86dceb72b25111f7457785a619b1d70ca9280c9401d5ae1d517bad0adc' 
  AND token = 'TK8BAw6bS0wikCD6uUiX+skPtTEv4AEXJCl49qalLeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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