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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abde78d3ec2139d2bfff58aa03e0f99f3d8a409e843ffc5d265584bd86c8a345' 
  AND token = '0MT6JbkFSOHCms4nq0W77wSjncNTjpG5zD1nCbIw9YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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