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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e8e4fcdfaa47ecfde14ce030591915dceb06cab49da5987f745e6a014b691c' 
  AND token = 'PusjlEU5JQvLorrKmacfGbSJttOfbSLQBXBIweu3/QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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