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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e769a735087924f05f78020e272e91c9d40b34c402a118ee7a0415839b8e02' 
  AND token = 'fhOk5As2fMsNqdfdO6R870XHPvlgGzT4OWaO7oDvmVE=' 
  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"
    }
  }
}