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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b04b0062cbe28ef2536794166377b09ad90e5665f885334e18b592a38a0c92' 
  AND token = '8MbPztnVhm7oAWt+GmHU3xQQrxlbXL/x9w0AfaJl3+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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