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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94581c8ed7b75082d45d5cdc71ca3374465142313e0da40f0f4e52f4f379059d' 
  AND token = 'FT4y9mlVFinQjfWrrhhJRZasENAg3E1ctNbJ3Ww7z7E=' 
  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"
    }
  }
}