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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9b38745a7e1758e78cc0721bc3dcdd26a608d06e43b4f254f67ee3c8982729' 
  AND token = 'ozkzOe6vX3yvMrQD+Tq/fFL859ob9LeYkHZ9tgVZpls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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