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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f09a191b7a6d2c5df9a5d8826c75006059bc39ec0502f707be397e6f66cdce7' 
  AND token = 'y2e2g6sy5miPTNskRm3uJDI34vPl3bhIh2V6Nkj8J7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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