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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abc40cc55cb15e0bdaf079a6a940b91b21a07415138171ddf2c6edf2316ff49' 
  AND token = 'VXF37e8pDKWmx+WS9ebgbBnmrNItvFvQW0/SATOzDGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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