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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b33a8f193102abf5a8b49191c7979663e6b605a833ef0aa225874d744a088c4' 
  AND token = 'AiTo47Vx1d+3P5SA8PP7n2BNKExTTNjXsqRp2T51bWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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