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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414dd461ef9e950d3f8997b616c2ad2470118913bc07cd4f69752524b6aa30c0' 
  AND token = '92WuiYAk11cVLQtuC1RVg5Fs8SEe/xuXh/J5YPjibxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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