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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d201f904cce51834b31ed33dab580e74d5584c484d0d59dfd97dbe27f1f7154' 
  AND token = 'XiUWZRL1lVqleKAabFusiRRd4eyAv1T6LzaVa7NWp8g=' 
  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"
    }
  }
}