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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10cc1f4cacec9b87dc1a99fc4a4945639060cd5080efa57a99b01054215f854' 
  AND token = 'gUX09U9iEmXOrGlVBxGelV9kwqw/nJiYYw2zG/haFwY=' 
  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"
    }
  }
}