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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1b26888abf3424107f1316a8ca5f2bc4ba7c6d3fd2a002ab4c72393621e359' 
  AND token = 'vEtAjmAx71zgvr1KbKAh8GQTie0AMyNnnv7EKzkpq+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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