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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c99157de0aaf88acd3a743a50033871d7b78f6a59e46f75200e594032eed625' 
  AND token = 'Y3yPSXEFfMLerfMsS11s11rI+MvO5sjcBStAOiD9jJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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