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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6836c7db7e9790cc4e07d620a9f91b39ea82c5184f1c0bafd46c90db18de401f' 
  AND token = 'yLEbBbHHgIqSHHl0Mi7WG5qX2mm98iBAgGblPL5hLGQ=' 
  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"
    }
  }
}