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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d1e5228ca8a4b75de2a778ac1e7755eb5034ca180941ef95a561d90c028d94' 
  AND token = 'cr3RHCpOlVKG5zVBvz6uGfM2G8RCIqK9mJViCtRAFKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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