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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb85fb805cc5a2912da46e2bbd4e1ed45d15f46795505bb32da2b2254ebfc702' 
  AND token = 'jSi/Ejf0bNejVZD9KX54g9d0fM41Y3oNcakywZpNj4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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