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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3712d680cb524863e3d3e7173472d3070a00d79bb6e8d3caabc83b55566f4939' 
  AND token = 'Op+nUtJmDyEWlNZVbZF/6EheJJiE0iac2YcXpp4FOas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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