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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45dc8fd86bae5da52c29367296ff68c675ddb1e4bd63a3a22991389f5854484e' 
  AND token = 'GXs9Blh9DnR2cOst8v4O3o9JvrJGCX5uR0oWAIga+5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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