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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fc3023f7ecd6fb7cc814e826852b0951ecbaee8e9f16ae4d5520fb88d5a54a' 
  AND token = 'xf6hVmC3BIOVnD3GXyTTSqYSMBBYc/PCEXBv1Lq1hbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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