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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94eca9fe37a3ea7e3bc8a408cf139842ae01dcaaaf1582841c7bac8334c32132' 
  AND token = 'vyNs3J+w88XCfUNygtG3ZDkIvPRHjCDOfq7t+O/krCs=' 
  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"
    }
  }
}