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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87f044211cd0de63d7bbb04154976e92b871a2672ca64491563b9e4aa0d9ad0' 
  AND token = 'hdKh6+j7LMLa3Zx4bImIbpJMrkn2LHwiFoxDuAkGRGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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