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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fc735cdd82e22a0c1a28b4fac890c1d16c518d69c509c18135a6e85fbb1e48' 
  AND token = 'jfOyoHViwUip07fT/vuvYI0dV+JW+AuTYIkX+vEJeNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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