SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a58c3b2dc740622ed556459cb952baf39a2307dd18910cc8ef74e818a535181' 
  AND token = 'hy8F+0YqTKGSmt0f0dD/12qU+LnJjMQ+/ivdpLdv2pA=' 
  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"
    }
  }
}