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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789a6be35607ade601f9ccf02e70b260486162b90ec9a3058b7fd83c0901e00c' 
  AND token = 'unNq8ShsnAk8gpyJ96JTnIb2e/Yxayo0WHCMJNIUiaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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