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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4751074fe69e147c9b9cdb50583b2d0402cc324275a112d8080a7b68b697434' 
  AND token = '83461YyAG1H7n7eD6Zx3l7Vjrqo5rZL+aOtDO97ncaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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