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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea81e858a9317e06f04699d13f56d70233bfdbc4e45ff0d7964bb8dbc423760d' 
  AND token = 'sA2650M0B0GEL5+Sm1WjR4jkQKRy3WW75MJIaHt4j30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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