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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a977a8cfea150d14d823aeb8f0ddf9c72466e9054b296b2e5ce6d0ca14eded5' 
  AND token = 'QUuWVkKR9c+Z62NV8f/lSakJL0rXR1zJNk7N24Kv/oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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