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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6830f4a5e6fe2c823e5bd0a907a759c0589b6231a8a2f1f20b45c973d29dcffc' 
  AND token = 'aIc6eW/fNo1clzHyNr2NfnA8DbpyPu+EBg7wxv0zyWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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