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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abdfd65c93c7fce47d38567662a5172f1cdb813c55a2d4ffac31cd3d2a35216' 
  AND token = 'CQzwuH8PQbMXE9/BfRB5JS1yeDiDAgUe6U+xGNT+CTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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