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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d86d0de94570193d39013c048b67e878a60469a025e9499b9ffb8ac3d56cf22' 
  AND token = 'tpK6vIUJmNgx0YvSl03/26VaPsom1LkS+inK0g5cfRw=' 
  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"
    }
  }
}