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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f576878071db63e2a913b8f1580dab39fb6e970fd2bde658c911095ed906db' 
  AND token = 'AFecguwlOq1/Y29dtOHVeJUeRd1e8UKCDstUyBnH5Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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