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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68e5439cab479b66166020038971a1ef36b41bc0cab8003efa5081d28738510' 
  AND token = '0rtmz2F5gUX9FOyra48YcNEm1gcLW/bC3Wyrexu5RPw=' 
  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"
    }
  }
}